نتایج جستجو برای: population dynamic

تعداد نتایج: 1086300  

Journal: :Physical review 2023

The deterministic generation of multiexcitation subradiant states proves to be challenging. Here, we present a viable path towards their transient in finite-sized ordered arrays dipole-dipole coupled quantum emitters, based on incoherent driving the atomic ensemble. In particular, show that maximal coupling long-lived is achieved if only half atoms are initially excited. We characterize nature ...

2008
Shuai Zhang Dongsheng Wang Linyi Li Yongda Yuan

Faced upon the research status of Aculops lycopersici, the importance of population dynamic has been put forward. The feasibility and superiority of cellular automata applied in the simulation of Aculops lycopersici has been discussed. This paper has put forward an Aculops lycopersici population dynamic model prototype based on cellular automata, the result showed that this model can be used to...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده ریاضی 1390

the main objective in sampling is to select a sample from a population in order to estimate some unknown population parameter, usually a total or a mean of some interesting variable. a simple way to take a sample of size n is to let all the possible samples have the same probability of being selected. this is called simple random sampling and then all units have the same probability of being ch...

Journal: :Appl. Soft Comput. 2011
Dan Simon

We derive a dynamic system model for biogeography-based optimization (BBO) that is asymptotically exact as the population size approaches infinity. The states of the dynamic system are equal to the proportion of each individual in the population; therefore, the dimension of the dynamic system is equal to the search space cardinality of the optimization problem. The dynamic system model allows u...

2013
Radhika Dhingra Violeta Jimenez Howard H. Chang Manoj Gambhir Joshua S. Fu Yang Liu Justin V. Remais

Poikilothermic disease vectors can respond to altered climates through spatial changes in both population size and phenology. Quantitative descriptors to characterize, analyze and visualize these dynamic responses are lacking, particularly across large spatial domains. In order to demonstrate the value of a spatially explicit, dynamic modeling approach, we assessed spatial changes in the popula...

2015
Tanja Stadler Timothy G Vaughan Alex Gavryushkin Stephane Guindon Denise Kühnert Gabriel E Leventhal Alexei J Drummond

One of the central objectives in the field of phylodynamics is the quantification of population dynamic processes using genetic sequence data or in some cases phenotypic data. Phylodynamics has been successfully applied to many different processes, such as the spread of infectious diseases, within-host evolution of a pathogen, macroevolution and even language evolution. Phylodynamic analysis re...

Journal: :The American naturalist 2003
Brian O Ma Peter A Abrams Chad E Brassil

We investigate the dynamics of a series of two-prey-one-predator models in which the predator exhibits adaptive diet choice based on the different energy contents and/or handling times of the two prey species. The predator is efficient at exploiting its prey and has a saturating functional response; these two features combine to produce sustained population cycles over a wide range of parameter...

Introduction and purpose: The ability of the elderly to maintain balance during cognitive activity changes. Given the importance of recognizing the nature of the balance disorder among the elderly and the importance of verbal commands in rehabilitating such disorders, the purpose of this study was to investigate the Effectiveness of Dual Task and Focus of Attention Intervention on Balance in El...

Introduction and Aim: This study aimed to determine the effect and persistence of neuromuscular correction programs on landing position, static and dynamic balance in athletes with Dynamic Knee Valgus defects. Methods: The statistical population of this quasi-experimental study included teenagers athletes in soccer with dynamic knee valgus deformity who were purposefully selected and randomly ...

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